Question about Philips Magnavox 27MS343S 27" TV

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Magnavox 27ms343s shuts down after 4 seconds. high voltage goes past 30kv. and then drops to 0 . I changed the str regulator. same problem

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Re: magnavox 27ms343s

C2455 &C2458, I think......Check for bad caps in horiz drive circuit + solder any / all bad connects...................T.

Posted on Nov 22, 2007

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Burning smell, then quit. 4 yrs old.

That is not a good sign, the problem is in the high voltage, especially if it was a funny smell it would indicate the high voltage transformer "flyback transformer" is toast along with other parts. The set is 4 years old, and new tv's are designed to break down anywhere from 3 to 5 years, probably more cost effective to buy new.

Jan 13, 2011 | Philips Magnavox 27MS343S 27" TV

2 Answers

When I turn my KV-34XBR800 on, the picture will not come on and the standby light keeps on blinking 7 times each time.

Seven blinks of standby led in Sony sets denotes a High Voltage Shutdon proble. It is a self diagonosis process of the microcomputer Ic inside it, which senses the high voltage and shuts down the whole system to prevent it from further damages. The high voltage means that not the high line voltage of your househod supply, but the voltage inside the circuit board of the TV exceeds more than normal. Your tv, being 34", have a high tension voltage of 32,000VDC at the final anode of the picture tube. This voltage depends on the main regulated voltage goes into the circuit board from the power regulator system. There is a power regulator built sytem inside your TV, to regulate the voltage send to main board, which bears the Line Output Transformer [LOT], which in turn generated the above said high voltage. The normal regulated voltage going to board may be around 135VDC, to a 34" tv. Even a rise in, say, 2 voltage more than normal may cause high voltage to rise up considerably high enough to get it shut off. Soney sets are normally have STR regulated power supply system. It is very accurate and durable. The main fault comes to it is soldering trouble. The above said STR regulator may rise to as high as 90 degree centegrede when working. Repeted heating and cooling, make the soldering on its legs to get loose contacted; causing improper regulation process. Your tvs case must be so.
You just open your TV, and find out the regulator section inside it, where the AC input voltage goes into. Just pull it out and resolder all suspected points by applying a little more solder; as exact bad solder point is very difficult to locate. We in service field also does this. 90% sure that this will retify your problem.
Take proper care before opening your TV. Keep in mind that you are going to work with an electrical equipment, which have as high as 32,000VDC poins are inside it while working. Take all precautions. Keep children away from you while you works. Never allow them even stand beside you Ok.

Nov 09, 2010 | Sony FD Trinitron WEGA KV-34XBR800 34" TV

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Trying to find a code for my new tv

one of these should work for you.

Magnavox 0 0 5 4 ,1 2 5 4 ,0 0 3 0 ,0 1 7 9 ,0 1 8 7 , 0 0 9 6 ,
0 0 2 0 ,0 1 8 6 ,0 3 8 6 ,0 0 2 4

Please rate my help++++Thanks for using FIXYA

Jul 01, 2010 | Philips Magnavox 27MS343S 27" TV

1 Answer

When I turn it on it goes right back off in like 2 seconds- I can hear it come one and start to hear the sounds but it clicks right back off

your high voltage protect circuit is working properly.
take the tv to a tv shop to have them find out the reason for excessive high voltage. Your tv is protecting you from a possible fire.

Jan 26, 2010 | Philips Magnavox 27MS343S 27" TV

2 Answers

The problem I am having is that when I turn on our tv vcr/dvd combo unit, it only wants to stay on for a few seconds and then it shuts off.

I have fixed one of these combos before. The problem seem to always been the zener diode to regulate power. It developes a leak which would cause increased voltage, and goes into shutdown mode.

Jun 28, 2009 | Philips Magnavox 27MS343S 27" TV

2 Answers

Magnavox 27ms343s tv won't turn on manually or with remote, help

If you are comfortable with tool sthere is a fuse inside the unit right where the plug goes in. I would check this first. Caution unplug it first VERY high voltage inside 30,000 volts!!!

Mar 24, 2009 | Philips Magnavox 27MS343S 27" TV

1 Answer

Screen oversize picture

Hello sidley,

The problem you described might be "blooming" This happens due to poor HV (High Voltage) regulation. The problem might be with the High Voltage Transformer and or the Horizontal Output Transistor.
The problem might also be related to the associated circuitry of the two components.

I hope this helps
Thank you,

Jan 27, 2008 | Philips Magnavox 27MS343S 27" TV

1 Answer

Projectal tv

TV's have a circuit that monitors the high voltage and shuts down the set if it senses something amiss.
On CRT types, figure on replacing the flyback transformer.

Jan 02, 2008 | Philips Magnavox 27MS343S 27" TV

2 Answers

Tv has an advertisement that wont go off

Press the up and down volume buttons on the TV at the same time. This will turn off demo mode.

Aug 29, 2007 | Philips Magnavox 27MS343S 27" TV

2 Answers

My TV keeps shutting off

Tvtek is on the right track. The remote will not solve the problem. Sounds like a voltage regulator in HV circuit if it only lasts a few seconds. If it stays on for a couple of minutes, beam limiter cicuit is pushing to overload and shutting unit down. Magnavox set not hard to repair, but a 27" set is not cost effective to repair either.

Jun 06, 2007 | Philips Magnavox 27MS343S 27" TV

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